A kind of fully recycled concrete and preparation method thereof

A technology of recycled concrete and concrete, which is applied in the field of building solid waste recycling, can solve the problems of increasing cost and energy consumption, and achieve the effects of improving efficiency, reducing cost, and improving the uniformity of dispersion

Active Publication Date: 2022-07-29
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Then, it needs to be shipped separately during transportation, multiple silos are required when mixing recycled concrete, and recycled aggregates of various particle sizes are remixed, which significantly increases cost and energy consumption

Method used

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  • A kind of fully recycled concrete and preparation method thereof
  • A kind of fully recycled concrete and preparation method thereof
  • A kind of fully recycled concrete and preparation method thereof

Examples

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Comparison scheme
Effect test

preparation example Construction

[0088] The present invention provides a method for preparing continuously graded regenerated aggregate, which is prepared by using a continuous graded regenerated aggregate intelligent crushing integrated system, comprising the following steps:

[0089] 1) The construction solid waste raw materials are input into the primary crushing device from the feeding device for crushing, and the crushed construction solid waste raw materials are screened by the screening device to remove the slag impurities to obtain material a;

[0090] 2) The material a is transported to the secondary crushing device through the first transmission device for crushing, and the bulk impurities in the material a are sorted out by the sorting device to obtain the material b;

[0091] 3) The material b is transported to the sampling and dispersing device and the belt scale respectively through the second transmission device, and the material b transported to the sampling and dispersing device is vibrated an...

Embodiment 1

[0165] The construction solid waste raw materials are fed from the raw material silo to the feeder through the conveyor belt, and then fed into the jaw crusher for crushing. The jaw crusher is a PE-600×750 type jaw crusher. It is 400-600mm, preferably 500mm, the discharge particle size is 150-200mm, preferably 180mm, and the crushing capacity is 80-240t / h, preferably 160t / h.

[0166] The crushed construction solid waste raw materials are screened by a vibrating screen to remove the slag impurities, and the material a after the slag is screened is obtained. Then, the material a is transported to the roller crusher at a constant speed of 0.2m / s by the conveyor belt through the lower chute for crushing, and the material b is obtained. And the block impurities are sorted by intelligent jet sorting equipment, the density-based material types are distinguished, and the block materials with too low density are screened and sent to the block impurity storage room, and the sorting rate...

Embodiment 2

[0172]The continuously graded recycled aggregate sample 1* prepared in Example 1 was mixed with other components to prepare the fully recycled concrete water-stable material sample 1#. In the fully recycled concrete water-stable material sample 1#, by mass percentage, the continuously graded recycled aggregate sample 1* is 90%, Portland cement is 3%, water is 6.7%, and sodium sulfate is 0.3%. In the specific preparation, firstly add the continuously graded recycled aggregate sample 1* and half the amount of water according to the above proportions for stirring, then add other components and the other half of the water for vibration stirring, and then press and shape.

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Abstract

The invention provides a fully recycled concrete material, which comprises the following components by mass percentage: 70-90% of continuously graded recycled aggregate; 3-15% of cement; 7-15% of water; and 0-0.3% of activator; Admixtures 0‑0.2%. The present invention further provides a preparation method of fully recycled concrete material. The invention provides a fully recycled concrete and a preparation method thereof. The continuous gradation recycled aggregate used is controllable in gradation, covers recycled coarse aggregate, recycled fine aggregate and recycled fine powder, and achieves a tightly packed state. Continuously graded recycled aggregates give full play to the filling effect of complete continuous grading, the micro-filling effect of recycled micropowder and the comprehensive effect of pozzolanic activity, and achieve a large amount of recycled materials, which is conducive to promoting the full utilization of construction solid waste resources and can be Maximize the use of construction solid waste, and reduce the energy consumption of first screening in the process of recycling construction solid waste and post-mixing in the concrete preparation process.

Description

technical field [0001] The invention belongs to the field of construction solid waste recycling, and relates to a fully recycled concrete and a preparation method thereof. Background technique [0002] At present, my country's construction solid waste recycling industry has a certain technical accumulation and technological progress. After the construction solid waste is classified, wood, plastic, steel bars, etc. are sorted out and reused, and the remaining waste concrete and bricks are crushed and screened. After separation and cleaning, it can be made into coarse aggregate, fine aggregate and recycled fine powder, which are used to prepare new recycled concrete or non-burning bricks and other recycled products. However, the aggregate gradation of the crushed products in the existing construction solid waste recycling process is not controlled, and it is necessary to obtain recycled aggregates of different particle sizes through subsequent screening. Then, it needs to be s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B20/02B02C21/00B02C25/00B28C5/00G01N15/10
CPCC04B28/04C04B20/026B28C5/003B02C21/00B02C25/00G01N15/10G01N2015/1081G01N2015/1087G01N2015/1093C04B2201/50C04B2111/00017C04B18/167C04B22/147C04B2103/302C04B22/062C04B22/064
Inventor 肖建庄刘琼丁陶马旭伟韩女
Owner TONGJI UNIV
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